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calculati:

(n-3)!/(n-5)!


Răspuns :

[tex] \frac{(n-3)!}{(n-5)!}= \frac{1*2*3*...*(n-3)}{[1*2*3*...*(n-3)]*(n-4)*(n-5)}= \frac{1}{(n-4)(n-5)} [/tex]
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